package com.lqk.netty.tcp;


import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;

import java.nio.charset.Charset;
import java.util.UUID;

public class MyServerHandler extends SimpleChannelInboundHandler<ByteBuf> {
    private int count;
    @Override
    protected void channelRead0(ChannelHandlerContext ctx, ByteBuf msg) throws Exception {

        byte[] bytes=new byte[msg.readableBytes()];

        msg.readBytes(bytes);   // 将msg中的数据读到 bytes 数组中

        // 将 bytes 数组转成字符串
        String message=new String(bytes, Charset.forName("utf-8"));

        System.out.println("服务器端接收到数据 "+message);
        System.out.println("服务器端接收到消息量= "+(++count));

        // 服务器会送数据给客户端，回送一个随机id
        ByteBuf responseByteBuf = Unpooled.copiedBuffer(UUID.randomUUID().toString() + "\n", Charset.forName("utf-8"));
        ctx.writeAndFlush(responseByteBuf);
    }

    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
        cause.printStackTrace();
        ctx.close();
    }
}
